30 lines
971 B
JavaScript
30 lines
971 B
JavaScript
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'use strict';
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const assert = require('assert');
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// Set some preload link headers which we can use with Cloudflare to turn into 103 early
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// hints, https://developers.cloudflare.com/cache/about/early-hints/
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//
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// This will turn into a nice speed-up since the server side render can take some time
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// while we fetch all the information from the homeserver and the page can have all of
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// the assets loaded and ready to go by that time. This way there is no extra delay
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// after the page gets served.
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function setHeadersToPreloadAssets(res, pageOptions) {
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assert(res);
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assert(pageOptions);
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const { styles, scripts } = pageOptions;
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const styleLinks = styles.map((styleUrl) => {
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return `<${styleUrl}>; rel=preload; as=style`;
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});
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const scriptLinks = scripts.map((scriptUrl) => {
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return `<${scriptUrl}>; rel=preload; as=script`;
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});
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res.append('Link', [].concat(styleLinks, scriptLinks).join(', '));
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}
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module.exports = setHeadersToPreloadAssets;
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